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There is absolutely no reason in the world this guy needs to explore those feelings with this woman. If I were dispensing the advice, I'd say, "Keep it to yourself, buddy." All this can do is lead to disaster. Nobody has any intention of ruining their relationships when these things start, but nine times out of ten they WILL if they pursue this self-serving route.
Don't do it, my friend. You're fooling yourself if you think you have no intention of wrecking what you have. See? It's there, isn't it? The fantasy that you can leave and find true love, or at least have a great affair.
Stop.